/* styles.css */
body {
    font-family: Arial, sans-serif;
    margin: 0;
    padding: 0;
    display: flex;
}

.sidenav {
    height: 100%;
    width: 250px;
    position: fixed;
    z-index: 1;
    top: 0;
    left: 0;
    background-color: #333;
    overflow-x: hidden;
    padding-top: 20px;
}

.sidenav a {
    padding: 6px 8px 6px 16px;
    text-decoration: none;
    font-size: 17px;
    color: #818181;
    display: block;
}

.sidenav a:hover {
    color: #f1f1f1;
}

main {
    margin-left: 250px; /* 同 sidenav 宽度 */
    padding: 20px;
}
